Techniques for intra-user equipment and inter-user equipment cancelation of overlapping communications
Methods, systems, and devices for wireless communications are described. Wireless communications systems may employ one or more scheduling constraints to support efficient utilization of techniques for intra-device handling of overlapping scheduled uplink transmissions (e.g., intra-device dynamic resource cancelation and multiplexing) as well as inter-device handling of overlapping scheduled uplink transmissions (e.g., inter-device dynamic resource cancelation and multiplexing). Scheduling constraints may define how a device may apply intra-device and inter-device multiplexing and cancelation rules for various scenarios. For example, a device may apply intra-UE cancelation rules before inter-device cancelation rules. In some examples, later-received grants or uplink preemption indications (ULPIs) may not change a device's previously established decision to drop an uplink transmission. As another example, a device may not expect to receive a grant for an uplink transmission that would arise in subsequent cancelation of that uplink transmission due to a previously-received grant or previously-received ULPI.
1. An apparatus for wireless communication at a user equipment (UE), comprising:
a processor,
memory coupled with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
receive a first grant for a first uplink transmission scheduled for transmission by the UE;
receive, after receipt of the first grant, a second grant for a second uplink transmission scheduled for transmission by the UE;
determine that the first uplink transmission and the second uplink transmission are scheduled so as to satisfy a scheduling constraint that is based at least in part on a first priority of the first uplink transmission being greater than a second priority of the second uplink transmission, the scheduling constraint further based on whether the first uplink transmission overlaps with the second uplink transmission, wherein the scheduling constraint indicates a probability that the UE will receive a grant scheduling a low priority uplink transmission that overlaps with a previously scheduled high priority uplink transmission; and
transmit the first uplink transmission or the second uplink transmission based at least in part on satisfaction of the scheduling constraint.
2. The apparatus of claim 1 , wherein the instructions to transmit the first uplink transmission or the second uplink transmission based at least in part on satisfaction of the scheduling constraint are executable by the processor to cause the apparatus to:
transmit the first uplink transmission.
3. The apparatus of claim 2 , wherein the instructions are further executable by the processor to cause the apparatus to:
identify that the UE has data to be included in the first uplink transmission, wherein the first uplink transmission is transmitted based at least in part on the UE having data to be included in the first uplink transmission.
4. The apparatus of claim 2 , wherein the instructions are further executable by the processor to cause the apparatus to:
discard the received second grant based at least in part on the scheduling constraint, wherein the first uplink transmission is transmitted based at least in part on the discarding.
5. The apparatus of claim 1 , wherein the instructions to transmit the first uplink transmission or the second uplink transmission based at least in part on satisfaction of the scheduling constraint are executable by the processor to cause the apparatus to:
transmit the second uplink transmission.
6. The apparatus of claim 5 , wherein the instructions are further executable by the processor to cause the apparatus to:
determine to skip the first uplink transmission based at least in part on a buffer status of the UE being below a threshold, wherein the second uplink transmission is transmitted based at least in part on the determination to skip the first uplink transmission.
7. The apparatus of claim 6 , wherein the first uplink transmission comprises a high priority scheduling request or a high priority uplink configured grant transmission.
8. The apparatus of claim 1 , wherein the scheduling constraint is satisfied based at least in part on the first uplink transmission and the second uplink transmission being non-overlapping.
9. The apparatus of claim 1 , wherein the first uplink transmission comprises a hybrid automatic repeat request acknowledgment transmission that is to be transmitted in response to a semi-persistently scheduled physical downlink shared channel transmission.
10. The apparatus of claim 1 , wherein the first uplink transmission comprises a semi-persistent channel state information transmission.
11. An apparatus for wireless communication at a user equipment (UE), comprising:
a processor,
memory coupled with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
receive an uplink cancelation indication for a first frequency-time resource;
receive, after receipt of the uplink cancelation indication, a grant for an uplink transmission scheduled for transmission by the UE in a second frequency-time resource;
determine that the uplink transmission is scheduled so as to satisfy a scheduling constraint that is based at least in part on whether the first frequency-time resource overlaps with the second frequency-time resource, wherein the scheduling constraint indicates a probability that the UE will receive a grant scheduling a high priority uplink transmission that overlaps with a previously canceled frequency-time resource; and
determine to preempt the first frequency-time resource and transmit the uplink transmission based at least in part on satisfaction of the scheduling constraint.
12. The apparatus of claim 11 , wherein:
the uplink transmission is a physical uplink shared channel transmission or a sounding reference signal; and
the scheduling constraint is satisfied based at least in part on the first frequency-time resource being entirely separate in time from the second frequency-time resource.
13. An apparatus for wireless communication at a base station, comprising:
a processor,
memory coupled with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
transmit a first grant for a first uplink transmission scheduled for transmission by a user equipment (UE);
identify a scheduling constraint based at least in part on a first priority of the first uplink transmission being greater than a second priority of a second uplink transmission to be scheduled by a second grant transmitted after the first grant, wherein the scheduling constraint indicates a probability that the UE will receive a grant scheduling a low priority uplink transmission that overlaps with a previously scheduled high priority uplink transmission; and
transmit, after the first grant, the second grant in accordance with the scheduling constraint.
14. The apparatus of claim 13 , wherein the instructions are further executable by the processor to cause the apparatus to:
receive the first uplink transmission based at least in part on the transmitted first grant.
15. The apparatus of claim 13 , wherein the instructions are further executable by the processor to cause the apparatus to:
receive the second uplink transmission based at least in part on the transmitted second grant.
16. The apparatus of claim 15 , wherein the instructions are further executable by the processor to cause the apparatus to:
determine the UE skipped the first uplink transmission based at least in part on receiving the second uplink transmission, wherein the determination that the UE skipped the first uplink transmission is based at least in part on a buffer status of the UE being below a threshold.
17. The apparatus of claim 13 , wherein the scheduling constraint further relates to the second uplink transmission scheduled to overlap with the first uplink transmission.
18. The apparatus of claim 13 , wherein the first uplink transmission comprises a hybrid automatic repeat request acknowledgment transmission that is to be transmitted in response to a semi-persistently scheduled physical downlink shared channel transmission or a semi-persistent channel state information transmission.
19. The apparatus of claim 13 , wherein the scheduling constraint provides that the UE does not expect to receive a grant scheduling a low priority uplink transmission that overlaps with a previously scheduled high priority uplink transmission.